static int add_direct_chain()

in mlx5/core/mr.c [304:351]

• 44 lines of code
• 4 McCabe index (conditional complexity)

static int add_direct_chain(struct mlx5_vdpa_dev *mvdev, u64 start, u64 size, u8 perm,
			    struct vhost_iotlb *iotlb)
{
	struct mlx5_vdpa_mr *mr = &mvdev->mr;
	struct mlx5_vdpa_direct_mr *dmr;
	struct mlx5_vdpa_direct_mr *n;
	LIST_HEAD(tmp);
	u64 st;
	u64 sz;
	int err;
	int i = 0;

	st = start;
	while (size) {
		sz = (u32)min_t(u64, MAX_KLM_SIZE, size);
		dmr = kzalloc(sizeof(*dmr), GFP_KERNEL);
		if (!dmr) {
			err = -ENOMEM;
			goto err_alloc;
		}

		dmr->start = st;
		dmr->end = st + sz;
		dmr->perm = perm;
		err = map_direct_mr(mvdev, dmr, iotlb);
		if (err) {
			kfree(dmr);
			goto err_alloc;
		}

		list_add_tail(&dmr->list, &tmp);
		size -= sz;
		mr->num_directs++;
		mr->num_klms++;
		st += sz;
		i++;
	}
	list_splice_tail(&tmp, &mr->head);
	return 0;

err_alloc:
	list_for_each_entry_safe(dmr, n, &mr->head, list) {
		list_del_init(&dmr->list);
		unmap_direct_mr(mvdev, dmr);
		kfree(dmr);
	}
	return err;
}